Telephone-exchange system



Aug g v H. P. CLAUSEN ET AL TELEPHONE EXCHANGE SYSTEM Filed June 5 1919 2 Sheets-Sheet 1 //4 ve n fans- Henry/P U/flusen 0'4 m /ea L. Goad/w H. P. CLAUSEN ET AL TELEPHONE EXCHANGE SYSTEM Filed June 5, 1919 2 Sheets-Sheet 2 //4 Vania/ 9 /7e/4/ y n C/dwsen Patented Aug, lh, WEA,

JEEJENRY JP. CLAUSEN, 01F MOUNT VERNON, AND CHARLES L. GOODRUMl, F YORK, N. Y., ASSIGNORS T0 'lIVlESTERN ELECTRIC COMPANY, INCORPORATED, 015 NEW YORK, Ill. Y., A CORPORATION OF NEW YORK.

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Application filed June 5,

To all whom it may concern."

Be it known that we, HENRY P. CLAUsEN and CHARLES L. GooDRUM, citizens of the United States, residing at Mount Vernon,

a in the county of Westchester and State of New York, and at New York, in the county of New York and State of New York, re-

spectively, have invented certain new and useful Improvements in Telephone-Exchange Systems, of which the following is a full,

clear, concise, and exact description.

This invention relates to special service systems for machine switching telephone exchanges. I

In systems employing so-called manual working, that is, where operators are employed for answering calls and -for setting up connections, certain special service features have been developed which are of great value, especially in private branch exchange working. One of these features is a means for summoning a particular person to the telephone when such particu ar person is away from his instrument. Should a call come in to a private branch exchange and were the operator there requested to complete a connection to a particular person, say, forinstance the superintendent of the establishment wherein the private branch exchange is located, and should the particular person be at that time away from his instrument, the operator, after an appropriate interval, would use a special means for summoning such particular person. This special means is in the resent day practice disassociated with the te ephone system, and such service is not supplied by the telephone companies. llt, however, is a valuable fea ture, and one which, from its nature should be retained in machine switchin telephone exchanges installed for private loranch exchange working.

The object of the present invention is to provide means whereby a calling party may summon a particular person when such particular person is away from his instrument.

A further object is to provide means whereby several particular persons may be simultaneously summoned should they be called while away from their instruments.

Accordingly, a signal circuit is wired up throughout the building in which the private branch exchange apparatus is installed, whereby audible signals in the form of the 19119 serial Ito. aoaoao.

- called does not answer his telephone within a reasonable time, a simple manipulation of the dial switch under the control of which the connection is originally set up, will set the signal circuit in operation to transmit the particular code corresponding with the telephone station called.

I The invention is illustrated in'the drawings in two figures. Fig. 1 shows diagrammatically a calling substation, a connector switch, a called substation and a si aling apparatus and circuit, and Fig. 2 s ows a second calling substation from which the call may be answered.

Briefly, the operation is as follows: The calling subscriber at substation 1, .desirin to communicate with the part who shoul be at substation 2, sets up t e connection in the usual manner, whereupon the tele-- phone bell at substation '2 commences to ring. llf, alter a certain period, the subscriber at substation 1 concludes that the party at substation 2 is not there, he will 'manlpulate his dial switch from any one of the finger holds, or simply manipulate his hookswitch rapidly one or more times,

whereupon the signaling apparatus will be actuated. The party who should be at substation 2, hearing himself paged as it were, goes to the nearest telephone 8 in the building and calls a special number. This special number is one blown to himsell only and it connects himto a ,set of multiple terminals connected with his own line at substation 2. Thereupon, the ringing of the telephone bell at' suhstation 1 is discontinued and conversation takes place between the calling substation 1 and the substation 8.

At the end of the conversation, both parties hang u and the apparatus in the connection 18 all restored in the ordinary Ell (ill

manner. It is thought the operation as a whole may be more clearly understood through the following detailed description.

The subscriber at substation 1, after removing his receiver from its hook, causes the extension of his line in the usual manner by automatic switches until the connector switch of Fig. 1 is seized; thereupon, the calling line relay 9 will be energized and in turn the first slow relay 10 will be energiz. A manipulation of the dial switch at the calling substation 1 now causes the line relay 9 to vibrate its armature, and a circuit on each back stroke is set up from ground, through the armature and back contact of the relay 9, the right-hand armature and front contact of the relay 10, thereafter in one direction through the winding of second slow relay 11, to battery and ground, and in another direction through side switch Wiper 12 in its first position, primary magnet 13, to battery and ground. Primary magnet 13 responds to each impulse separately, but the slow releasing relay 11 responds to the train of impulses as a whole. Primary magnet 13 causes the stepping of the brushes 1%, 15, 16 and 17 in a primary direction, whereby a particular group of lines is selected. Slow releasing relay 11, by attracting its armature, energizes the escape magnet 18 through a circuit extending from ground, armature and back contact of relay 19, winding of relay 18, right-hand armature and front contact of relay 11, to battery and ground At the end of this series of impulses, slow releas ing relay 11, being deprived of energizing current for a suficient length or time, retracts its armatures, in so doing opens the circuit for the escape magnet 18, whereupon the side-switch wipers are passed into their second position and the connector switch is ready to receive the last set of impulses. When this is sent in response to the manipulation of the dial. switchat the calling substation 1, the armature of relay 9 is vibrated as before, and upon each back stroke, a circuit is established which newsstands through the secondary magnet 2% instead of, as before, the primary magnet 13. Slow releasing relay 11 is energized as before, and the escape magnet 18 is also energized as before. Upon each energisetion of i et 201, brushes the secondary la to l? inclusive, are stepped their secondary direction until the selected line is reached, whereupon a test is made. at the end'of this series or impulses, slow relea ing relay 11 again retracts its armature, and by deenergising the escape magnet 18 causes the side-switch wipers to move into their third position.

it will be noticed that escape magnet 18 is slow to release, and that therefore, before the side-switch Wipers have to their third position, a circuit is established from the second position contact of the sideswitch wiper 21, through the contact and left-hand armature of second slow relay 11, the oil-normal contact 22, right-hand Winding of release magnet 23, to battery and ground. brush 16 will encounter a grounded terminal 24, and through the circuit just traced, the release magnet 23 will be energized and will thereby cause the release of the connector switch. The brushes 14 to 17, inclusive, will be returned tonormal, but the other automatic switches in the train will not be released since the test wire will be grounded over the left-hand Winding of release magnet 23 which is of high enough resistance to prevent the release magnets of the other switches from being energized, left-hand armature and contact of release magnet 23, the left-hand armature and front contact of relay 10 and the test terminal 25 of the connector switch. For a more detailed explanation of this action reference may be had to the patent to Goodrum N0. granted June 26, 1917. Through this circuit, the release magnet will remain encrgized, and thereupon a busy tone will be transmitted from the source of busy tone BZ to one side of the line and thence to the calling line in the usual manner. If, on the other hand, the called line is found to be idle, then upon the release of the escape magnet 18, the side-switch arms will be advanced to their third position, and the escape magnet 18 will again be energized over a circuit from ground, the armature and contact of relay 19, winding ct escape magnet 18, side-switch arm 26 in its third position contact, to battery and ground. Through the energization of escape magnet l8, the bell at the called substation E3 is rung through the flow of ringing current at the contact of escape magnet 18, through its armature, winding of relay 19, third position contact and side-switcb Wiper 2?, brush 15, terminal 28, the line to the called subst ion 2, through the bell. at the called substa 1011, back over the other side or? the called bus, terminal 2%), brush it, side switch arm 30 and its third position. con-- tact, front contact and armature of line rc-- lay 9, to ground,

Shoutd the called subscri. be within bearing distance of his own tcli iihone bell, l should he in answer to its summons, remove his r er rrom his hoolc he would cause sudiu nt tlow of rin LL current through relay 1.) to open. the circuit of the escape magnet 18, whereupon the side-switch Wipers would be passed into their fourth positions and the conversational circuit es tablished in the ordinary manner.

During the conversational period, the calling subscriber is supplied with talking eur- If the called line is busy, then aneaaie rent through the windings of the line relay 9, and the called subscriber is supplied with talking current through the windings of the called supervisory relay 31.

At the close of the conversation, the calling subscriber, by hanging up his receiver, deenergizes the line relay 9, in response to which relay 10 becomes deenergized, whereupon a circuit is established from ground, through armature and back contact of relay 9, righthand armature and back contact of relay 10, left-hand armature and back contact of relay 10, the off-normal contact 22, the right-hand winding of release magnet 23, to battery and ground, whereupon the connector switch is released in the manner hereinbefore described.

lif, on the other hand, the subscriber, who should be at substation 2, is in some other part of the building and does not answer the summons of his telephone bell, the calling subscriber 1 may manipulate his dial switch from any one of its finger holds, or merely manipulate his hookswitch as he does in manual ractice, whereupon, remembering that the si e-switch wipers are in their third positions during the ringing period, a circuit will be established from ground, through the armature and back contact of relay 9, the right-hand armature and front contact of relay 10, the side-switch wiper 12 and its third position contact, the brush 17, terminal 32, winding of relay 33, to battery and ground. Relay 33 looks up over circuit from battery and ground, through the winding of relay 33, its left-hand armature and front contact, the back contact and armature of relay 34, terminal 24, brush 16, side-switch wiper 21, and its third position contact, to

ground. This closes a circuit from ground,

contact and right-hand armature of relay 33, segment 35, brush 7, mounted on constantly rotating shaft 5, brush 52, primary winding of transformer 4, device 3, to battery an ground. Device 3 is a telephone transmitter attached to the stylus of a phonograph reproducer, and may be constructed in the manner set forth in the patent to Egerton, No. 1,246,895. The stylus 53 cooperates with a record 6 mounted'on the shaft 5. While the brush 7 is traveling over the segment 35, a certain part of the record 6 travels under the stylus 53, whereupon the device 3 translates such part of the record 6 into variations of the current in the circuit described. Such current variations are reproduced by the transformer 4 in the circuit 54 which extends throughout the establishment employing the private branch exchange. Connected to this circuit at various points are a number of loud speaking receivers 55, 56 and 57. These retranslate the current variations into sound waves, and thus the called party is paged by appropriately recorded spoken words such as John Doe on the telephone-John Doe on the telephone This is continuously repeated until the called subscriber is attracted thereby, and proceeds to set up a connection to his own line. This he may do by going to any substation, such as No.8, and dialing a special number. In responce to the dialing operations at substation 8, a circutwill be established between the substation 8 and the connector switch 36, which is in all respects similar to the connector switch in Fig. 1.

In response to further manipulations of the dial at substation 8, the brushes 37, 38, 39 and 40 may be set on the special number corresponding to the called subscribers substation. The terminals 41 and 42 complete circuits which will cause the ringing current being transmitted at present from both connector switches to be cut 0d, and to cause the side-switch wipers to both connectors to be advanced in position 4. In one case, this circuit may be traced from the source of ringing current connected to the contact of escape magnet 18 through its armature, winding of relay 19, third position contact and side-switch wiper 27, the brush 15, terminal 28, the conductor 44, terminal 41, brush 37, side-switch wiper 45 and its third position contact, front contact and armature of line relay 46, to ground. This causes the energization of the relay 19, and as before described, the passing of the side-switch wipers of the connector switch shown in Fig. 1 into their fourth ositions. Tn a similar manner, the relay 4'7 in the connector switch 36 is energized over the conductor 48, and the side-switch wipers of the connector 36 are passed into their fourth positions, whereupon conversation between the substation 1 and the substation 8 may proceed.

As the connector switch 36 sets its brushes 37 to 40 inclusive, on the terminals 41, etc, representing the special number correspond- .ing with the called substation 2, a circuit is completed from ground, through third position contact and side-switc wiper 49, brush 39, terminal 43, winding of relay 34, to battery and ground. Relay 34 in attracting its armature, opens the circuit of the code ringing control relay 33, whereby it is deenergized and the paging circuit 54 is rendered silent.

At the close of the conversation, when the receiver at the substation 1 is replaced on its'hook, the calling line rela 9 is deenergized and the connector switc in Fig. 15 released, and when the receiver at substation 8 is replaced the calling line relay 46 is deenergized and the connector switch 36 is released.

Another substation 50 is shown to illustrate how this special service may be supplied so that several oflicials of the enterprise may be aged simultaneously. Should a call be esta lished to the substation 50, the relay 51 may be energized in the same manner as relay 33, whereupon the part of the record coming under the stylus 53 during the .passage of the brush 7 over the segment 58 will also be reproduced in the circuit 54 and the receivers to 57 would cause the spoken words to be heard throughout the establishment, maybe as follows John Doe on the telephone, Richard Roe on the telephone, John Doe on the telephone, Richard Roe on the telephone Upon the close of the conversation, the connection is disestablished in the Wellknown manner.

\Vhat is claimed is:

1. In a telephone system, telephone lines, each including a calling signal, means for Y calling said lines and actuating said signals, a secondary calling signal common to said 111188, said secondary signal comprising a phonographic speech reproducing circuit arranged to reproduce calls'individually characteristic of said lines, and means dependent on the condition established for actuating a particular one of said first signals for subsequently actuating said secondary calling signal in a manner characteristic of the particular first signal actuated.

2. In a telephone system, telephone lines, each including a calling signal, a secondary calling signal comprising a phonographic speech reproducing circuit common to said lines, said secondary calling signal being arranged to reproduce different calls indii vidually characteristic of said telephone lines, means for selecting said lines and operating said individual signals, and means for thereupon correspondingly actuating said secondary calling signal.

3. In a telephone system, a plurality of telephone lines, a signal individual to each of said lines, a signal comprising a phonographic speech reproducing circuit common to said lines, said signal being arranged to said telephone lines, means individual to each of said lines for causing said circuit to operate in a manner to identify said line, and means for causing said circuit to operate to simultaneously identify a plurality of said lines.

In Witness whereof, We hereunto subscribe our names this 28th day of May A. 1)., 1919.

HENRY 1?. CLAUSEN. CHARLES L. GGODRUM. 

